Mark, To a greater or lesser degree all of them. Very early hammerguns were often bored with a full taper in the bore. It's my belief that Parker Bros. did quite a bit of experimenting with choke before settling on the ogee configuration. When did the ogee choke come into full time use? Good question...but I suspect somewhere in the 1880's.
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"Much care is bestowed to make it what the Sportsman needs-a good gun"-Charles Parker
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